I installed Avast with default settings and never touch on the Action setting. As I checked just now, it default to move to chest, if fail, delete.
Yeah I've submitted false positive just before I posted to this forum.
And then now, I'm not allowed to do anything. I've copied the VFP6.EXE from another PC to my PC, then Avast prompted malware again, then I put the Action to Ask, it just allow to Move to chest, Delete or Block.
BUT, if I manually scan the VFP6.EXE, it says no threat found.